首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
如图所示，质量M＝3kg的小车静止在水平光滑的平面上，在小车右端放上一个大小不计质量为m＝1kg的小物块，现在小车左端加一水平恒力F＝7N，物块与小车间的动摩擦因数μ＝0.1，小车足够长，求当小车向...
查看本题答案
包含此试题的试卷
高三下学期物理《》真题及答案
点击查看
你可能感兴趣的试题
如图所示质量M.=8kg的小车放在水平光滑的平面上在小车左端加一水平恒力F.F.=8N当小车向右运动
如图所示质量为m=1kg的滑块以υ0=5m/s的水平初速度滑上静止在光滑水平面的平板小车若小车质量M
如图所示质量M=8kg的小车放在水平光滑的平面上在小车左端加一水平推力F.=8N当小车向右运动的速度
如图所示质量M=8kg的小车放在水平光滑的平面上在小车左端加一水平推力F.=8N.当小车向右运动的速
如图所示光滑曲面轨道的水平出口跟停在光滑水平面上的平板小车上表面相平质量为m的小滑块从光滑轨道上某处
如图所示质量M=8kg的小车放在水平光滑的平面上在小车左端加一水平推力F.=8N.当小车向右运动的速
如图所示光滑曲面轨道的水平出口跟停在光滑水平面上的平板小车上表面相平质量为m的小滑块从光滑轨道上某处
如图所示质量M.=3kg的足够长的小车静止在光滑的水平面上半径R.=0.8m的1/4光滑圆轨道的下端
2015年·长春一模如图所示质量M＝3kg的小车静止在水平光滑的平面上在小车右端放上一个大小不计质
2015年·哈尔滨一模如图所示质量M＝3kg的小车静止在水平光滑的平面上在小车右端放上一个大小不计质
如图所示质量M=8kg的小车放在水平光滑的平面上在小车左端加一水平恒力F.F=8N当小车向右运动的速
如图所示质量为m1=0.3kg的很长的平板小车静止在光滑的水平面上现有一质量为m2=0.2kg的小物
如图所示一质量m1=0.6kg的小车静止在光滑的水平面上现有一质量m2=0.3kg的物块以水平向右的
如图所示质量M.=8kg的小车放在水平光滑的平面上在小车左端加一水平推力F.=8N.当小车向右运动的
如图所示光滑水平面上有一个静止的质量为M的小车它的上表面是由水平面连结1/4圆弧的光滑曲面组成一个质
如图所示将带电量Q=0.5C质量m’=0.3kg的滑块放在小车绝缘板的右端小车的质量M=0.5kg滑
质量M=3kg的长木板放在水平光滑的平面上在水平恒力F.=11N作用下由静止开始向右运动如图所示当速
如图所示一辆质量M.=3kg的小车A.静止在光滑的水平面上小车上有一质量m=1kg的光滑小球B.将一
如图所示质量M=8kg的小车放在水平光滑的平面上在小车左端加一水平推力F.=8N当小车向右运动的速度
如图所示质量M=8kg的小车放在水平光滑的平面上在小车左端加一水平推力F.=8N当小车向右运动的速度
热门试题
更多
除去下列物质中所含杂质括号中的物质所选用的试剂和装置均正确的是
1+x5的展开式中项x2的系数是用数字作答．
StephaniePlumNovelsbyJanetEvanovich JanetEvanovich'sseriesaboutbrashandbeautifulNewJerseybountyhunter赏金猎人StephaniePlumhasreadersaddicted.StartwithOnefortheMoneyandfollowthenumbertitlestofollowStephanie'sadventures. JacksonBrodieMysteriesbyKateAtkinson Atkinson'sliterarythrillersarewillwrittenintelligentandsuspenseful.JacksonBrodieisadetectivewhosolvescasesinScotlandandEnglandandthebooksalsohaveplentyofpersonaldetailsaboutBrodie.Noneedtoreadthesenovelsinorderalthoughtherearesomeconnectionsfrombooktobook. AlexCrossNovelsbyJamesPatterson Patterson'sAlexCrossseriesstartedwithAlongCameaSpiderin1993andhasbeenkeepingreadersentertainedeversince.Pattersonwritesshortchaptersfromseveralviewpointskeepingthepagesturningasreaderssolvehomicideswiththislikabledetective. KinseyMilhoneMysteriesbySueGrafton StartingwithAisforAlibiGraftonhaswrittenanalphabetofmysteriesstarringdetectiveKinseyMilhone.Thesemurdermysteriesarefastandfun. TheSouthernVampireSeriesbyCharlaineHarris DeadUntilDarkisthefirstbookinCharlene'sSouthernVampireserieswhichinspiredtheHBOTVseriesTrueBlood.Thesenovelsarefastandsexybutwellwrittenandfullofinterestingcharacters.Ifyoulikevampires吸血鬼orsupernaturalelementsinstoriesthisistheseriesforyou. 21.Ifyouareinterestedinbooksaboutadventureyou'dliketoread. A.KinseyMiloneMysteries B.AlexCrossNovels C.StephaniePlumNovels D.TheSouthernVampireSeries 22.WhichofthefollowingisNOTthenameofabook? A.TrueBlood. B.AlongCameaSpider. C.OnefortheMoney. D.AisforAlibi. 23.Whosebooksdon'tneedtobereadinorder? A.JanetEvanovich's. B.KateAtkinson's. C.SueGrafton's. D.JamesPatterson's.
下列有机物中既能使溴水褪色又能使酸性KMnO4溶液褪色还能与新制CuOH2悬浊液加热时发生反应的是
Theartofpaper﹣cuttinginChinamaydatebacktothesecondcenturysincepaper61inventbyCaiLunintheEasternHanDynastyinChina.Aspaperbecamemoreaffordablepaper﹣cuttingbecameoneofthemostimportant62typeofChinesefolkart.Later63differentregionsadoptingtheirownculturalstylesthisartformspreadtootherpartsoftheworld64usualtheartworksaremadeofredpaperasredisassociatedwith65happyinChineseculturebutothercolorsarealsoused. With66itlonghistorypaper﹣cutting67originatedinChinahasbeenverypopularamongtheordinaryChinesepeople.Peopleputuppapercutsonwallswindowsanddoorsatweddingceremoniesorfestivals68strengthenthecheerfulatmosphere. Chinesepapercutsarerichincontent.Theauspicious吉祥的designssymbolizegoodluckandtheavoidanceofevil.Thechildlotusandbatdesignssuggestafamilywith69largenumberofchildrenandgrandchildren.Birdslivestockfruitfishandwormsarealsofamiliarobjects70acceptbyChinesefarmers.Inawordpapercutsusedindifferentoccasionshavedifferentmeanings.
王斌同学在解答问题“同时掷两个骰子计算向上的点数之和是5的概率是多少”时给出了如下答案 记{mn}为投掷两个骰子向上点数分别为mn 则投掷两个骰子的所有可能结果为 {11}{12}{13}{14}{15}{16}{22}{23}{24}{25}{26}{33}{3.4}{35}{36}{44}{45}{46}{55}{56}{66}共计21种． 其中“向上的点数之和是5”的有{14}和{23}共2个． 所以所求概率为． Ⅰ你认为王斌同学的解答正确吗简述理由． Ⅱ如果王斌同学的解法不正确请在下面给出正确的解答．
下列有机化合物命名正确的是
已知函数则函数fx的导函数f'x等于
有下列几组物质请将序号填入下列空格内 ACH2＝CH﹣COOH和油酸C17H33COOHB12C60和石墨 C和D35Cl和37Cl ①互为同位素的是②互为同系物的是 ③互为同素异形体的是④互为同分异构体的是
下列各组中的反应属于同一反应类型的是
AsachildJanewasfondofanimals.AsaconsequencewhenshewasgrowingupallsheeverheardwasasfollowsJaneyoushouldbea41.You'regoingtoachievegreatsuccessinthatfield.That'stheverythingyoushoulddointhefuture.SowhenshegottotheOhioStateUniversityshetookbiologychemistryandsomeother 42studyinghardtobeavet. LateronshewonaRotaryAmbassadorialScholarshipwhichallowedhertospendher43yearstudyingabroadinManchesterEngland.Awayfromthefamilyandthe44fromthemshefoundherselfonedaysitingatherdesksurroundedbybiologybooksandstaringoutthewindowwhenitsuddenlyhitherI'mintotal45.Idon'twanttobeavet! 46shethoughtbackoverallthethingsshe'ddoneinherlifeandwhathadmadeherhappy.Andthenithither﹣itwasalloftheyouthleadershipconferencesthatshehadvolunteeredat47thecommunicationsandleadershipcourseshehadtakenasselectivecoursebackatOhioState.HowcouldIhavebeenso48?HereIaminmyfourthyearatschoolandjustfinally49thatI'monthewrongpath.Ijustnevertookthetimeto50ituntilnowshethought. 51byhernewthoughtJanespenttherestofheryearinEnglandtakingcoursesincommunicationsandmediastudies.When52toOhioStateshewas53abletoconvincetheadministrationtolethercreateherownprograminleadershipstudies54ittookher2yearslongertofinallygraduate.She55tobecomeaseniormanagementadviserinleadershiptraininganddevelopmentforthePentagon.She56foundedadrug﹣preventionorganizationthat57themessageLeadyourownlifewiththeskillandthe58tosayno. Sonever59someoneelse'sdreams.Ifyoulimityour60onlytowhatseemspossibleorreasonableyoudisconnectyourselffromwhatyoutrulywant. 41.A.engineer B.programmer C.doctor D.vet 42.A.subjects B.objects C.projects D.programms 43.A.first B.second C.final D.past 44.A.promise B.stress C.complaint D.press 45.A.vain B.misery C.delight D.surprise 46.A.Then B.Instead C.Perhaps D.Seldom 47.A.but B.or C.and D.so 48.A.disturbed B.ignorant C.intelligent D.inspired 49.A.aware B.unconscious C.afraid D.satisfied 50.A.complete B.accomplish C.permit D.admit 51.A.Inspired B.Disappointed C.Embarrassed D.Confused 52.A.relating B.returning C.responding D.referring 53.A.eventually B.especially C.hardly D.desperately 54.A.if B.as C.although D.despite 55.A.managed B.failed C.tried D.attempted 56.A.still B.never C.again D.also 57.A.proves B.conveys C.concludes D.warns 58.A.fact B.chance C.will D.truth 59.A.ignore B.break C.realize D.live 60.A.smiles B.choices C.mistakes D.reasons
函数的最小值是．
已知集合M={x|1≤x＜3}N={12}则M∩N=
The2016NobelPrizeinPhysicsissharedbythreescientiststheRoyalAcademyofSciencesannouncedinStockholmonTuesday.TheNobelPrizeinPhysics2016wasdividedwithonehalfawardedtoDavidJ.ThoulesstheotherhalfjointlytoF.DuncanM.HaldaneandJ.MichaelKosterlitzfortheoreticaldiscoveriesoftopologicalphasetransitionsandtopologicalphasesofmatter.物质拓扑相变和拓扑相. Haldanesaidhewasverysurprisedatthenewsaddingthathewasgladthattheirdiscoveriesfoundsomethingpreviouslyunnoticedbymanyandthattheyrevealedmorepossibilitiesforlookingfornewmaterials.Heparticularlypointedoutthatalotofworkwasstillongoing. Theyear'sprizeamountis8millionSwedishkrona0.93millionUSdollarsandwillbesplitproperlybetweenthethreewinners. Thewinnersaregivenasumofmoneywhentheyreceivetheirprizesintheformofadocumentconfirmingtheamountawarded.TheamountofprizemoneydependsuponhowmuchmoneytheNobelFoundation基金会canawardeachyear.Thepursehasincreasedsincethe1980swhentheprizemoneywas880000SEKperprize.In2009themonetaryawardwas10millionSEKUS$1.4million.InJune2012itwasloweredto8millionSEK. Iftherearetwowinnersofaparticularprizetheawardmoneyisdividedequallybetweenthewinners.Iftherearetheretheawardingcommitteecanchoosetodividethemoneyequallyorawardone﹣halftoonewinnerandone﹣quartertoeachoftheothers.Itiscommonforwinnerstodonateprizemoneytobenefitscientificculturalorcharitablecauses. 32.HowmuchprizemoneydoesThoulessget? A.8millionSwedishkrona. B.6millionSwedishkrona. C.4millionSwedishkrona. D.2millionSwedishkrone. 33.AccordingtothepassageHaldanethoughtthathisword. A.wasfarfromending B.wasbasedonmanypreviousstudies C.hadperfectlybeencompleted D.hadsurprisedthewholeworld 34.Theamountofprizemoney. A.hasbeeneverincreasingsincethe1980s B.hasbeeneverdecreasingsincethe1980s C.remains880000SEKeachyearafter2012 D.differsaccordingtotheNobleFoundation'saffordability 35.Whatdoesthelastparagraphtalkabout? A.Thepurposeoftheawardmoney. B.Thenumberofwinnersperprize. C.Howthewinnersareselected. D.Howtheawardmoneyisdealtwith.
已知函数fx=m+1x+lnxm∈R． Ⅰ当m=-2时求函数fx的单调区间和函数的最大值 Ⅱ若函数在区间12内有且只有一个极值点求m的取值范围．
若函数y=fx的定义域为M={x|-2≤x≤2}值域为N={y|0≤y≤2}则函数y=fx的图象可能是
HearingtheSweetestSongs MyparentssaidIlostmyhearingasababybutIknewIhadn'tlostanything.Noneofmypartshaddroppedoff.NothinghadchangedIcouldhearmusicthatwascloseenoughtome.Icouldalsohearmymomwhenshewasinthesameroom.IcouldevenhearmycatpurrifIputmygoodearontopofhim. Iwasn'tawareofanyhearinglossuntilIbegantowearahearingaidwhenIstartedlivingalone.Inoticeditruinedmypeaceofmindpencilstappingphonesringingandrefrigeratorshumming.ThenIbegantodiscovermanythingsIcouldn'tdo.Icouldn'ttellwheresoundscamefromnorcouldItellfirealarmsfromburglaralarms.IoncemissedajobinterviewbecauseImisheardtheaddressonthephone.ForthefirsttimeIhadtoadmitthatIhadlostsomething. Unlikeawheelchairmydisabilitydoesn'tannounceitself.WhenIgotjobsIchosetokeepitasasecret.OnedayabusinessfriendsaidNicolettesometimesinmeetingsyouanswerthewrongquestions.Peopledon'tknowyoucan'thearsotheythinkyou'restrangestupid﹣orjustplainrude.Itwouldbebettertojusttellthem.ButIknewifItoldpeoplemightseeonlymydisabilityandtheymightforgetthatIwasalsoawriterapainterandagoodgardener.Ifeltdisabledandhelpless. ThisbotheredmetillImetmyhusband.OnemorningattheshoreIwaslisteningtothesoundsoftheseawhenmyhusbandsaidHearthebird?Whatbird?IlistenedharduntilIheardatinysound.Ifhehadn'tmentioneditIwouldneverhavenoticedit.AsIlistenedslowlyIbegantohear﹣orperhapsimagine﹣adistantsong.DidIreallyhearit?Orjustheardinmyheartwhathesharedwithme?Irealizedthatsongsimaginedwereassweetassongsheardandsongssharedweresweeterstill. Thissharingiswhatboththedisabledandnon﹣disabledwant.Everyoneofusifwelivelongenoughwillbecomedisabledinsomeway.Let'sshare.Nowjustletmeseeyourlipswhenyouspeak.Andaskwhatyouwanttoknow.Theseareconversationsweallshouldhaveandit'snotthathardtobegin. 60.Whentheauthorworethehearingaidshe. A.feltbetterpreparedforthejobinterviews B.wasabletoenjoydifferentsounds C.experiencedasenseofloss D.wasteasedbyothers 61.Shedidn'ttellherdisabilitytoothersbecause. A.peoplemightfocusonherhearingloss B.shecouldgettheworkdoneasabled C.peoplemightbecuriousaboutit D.shewantedtodomorejobs 62.WhydidNicolettewritethepassage? A.Todrawpeople'sattentiontothehearingproblem. B.Totellpeoplenottotreatthedisableddifferently. C.Torememberthechallengesshefaced. D.Toshowhowmuchshemissedbefore.
首都师范大学数学科学学院在阶段测试中要考查六个学科已知数学分析考试必须安排在首场且高等代数与复变函数不能相邻则这六个学科不同的考试顺序总共有种
假如你是一所国际中学的学生会__你校将要举行为期两周的中学生夏令营8月1日至14日旨在增进学生对不同国家文化的了解.请你以学生会的名义拟一则通知. 内容包括1.活动介绍 2.报名要求英语水平沟通能力… 3.报名时间2017年5月10日至17日 4.报名地点学生会. 注意1.词数100左右 2.通知格式已给出不计入总词数 3.可适当增加细节以使行文连贯 NOTICE TheStudents'Union.
有机物可以通过不同的反应得到①②③三种物质．生成这三种有机物的反应类型依次为
下列化合物中既能发生消去反应生成烯烃又能发生水解反应的是
InChinathereareusuallytworeasonswhypeoplereceivemessagesfromfriendsandrelativesfromwhomtheyhaven'theardforawhile.ThefirstisaboutNewYeargreetingswhicharealwayswelcome.Thesecondreasonisoftenlesspleasanthoweverpeopleareincreasinglycontactinglonglostfriendsorevencasualacquaintancesandurgingthemtocastonlinevotesfortheirchildrenorgrandchildrenincompetitions. Thepracticewhichhasbeengrowingrapidlyhasnowreachedthepointwherepeoplearebecomingtiredandmayevenfeelannoyed. TheresultsofarecentsurveyconductedbytheJinhuaEveningNewsinEastChina'sZhejiangProvinceshowthat94percentof384intervieweeswereonceaskedbyfriendsorrelativestocastvotesonlinefortheirchildren.Thecontestsrangefromthecutestbabytodancingcompetitionsbutinmanyisthepeoplereceivingthemessageshaven'theardfromthesenderforalongtimeandhavenevermetthechildinvolved. Althoughthecompetitionsmayappeartobeharmlessfunsomeeducationprofessionalsareconcernedthattheycouldhaveanegativeeffectonchildren. TangSulanamemberoftheCPPCC'sNationalCommittee全国政协proposedabanononlinecompetitionsfeaturingchildrentopreventfuturepsychologicalissues.Shewasalsoconcernedthatpublicdisclosureofachild'spersonalinformationandpublicationofphotoscauseapotentialrisktothechild'ssafety. LiHongyanthemotherofanl1﹣year﹣oldgirlandan18﹣month﹣oldboyinBeijingsaidshehasneverurgedotherstovoteforherchildren.Althoughonthesurfacethechildrenarecompetingamongthemselvesviatheirparents'socialnetworksthecompetitionsarealsoaboutparentsseekingasenseofvictoryforthemselvessheSid.Itfeelsasthoughparentsareusingtheirbabiesastoolstowingloryforthemselvesratherthantrulyrespectingtheirkids'dignityandnature.Howeverdespiteherdislikeofthecontestsshehastwicevotedforthebabiesofclosefriendsbecauseitwouldbeembarrassingtosayno. 25.Whatisthebesttideforthetext? A.ReceivingMessagesAnUnhappyExperience B.TOSayNoAnEmbarrassingExperience C.ADilemmaVoteorNot D.Child'sSafetyandCastingVotesonLine 26.WhatdoestheunderlinedworddisclosureinParagraph5probablymean? A.ExposureB.Concern.C.Reputation.D.Competition 27.WhatcanbeinferredfromLiHongyan'swords? A.Herchildrendon'twanttojoininthoseonlinecompetitions. B.Sheurgespeopletovoteforthebabiesofherclosefriends. C.Sheagreestobringthechildrentotheirparents'socialnetworks D.Sheopposestheideaofparentsseekingvotesforchildren.
为了解水稻价格的波动情况某人对ABC三个城市中某一天的水稻价格进行调研得到三个城市的所有销售点的水稻价格元/吨数据如表所示 Ⅰ甲以B城市5个销售点水稻价格的中位数作为购买价格乙从C城市4个销售点中随机挑选2个了解水稻价格．记乙挑选的2个销售点中水稻价格比甲的购买价格高的个数为X求X的分布列及数学期望 Ⅱ如果一个城市的销售点水稻价格方差越大则称其价格差异性越大．请你对ABC三个城市按照水稻价格差异性从大到小进行排序只写出结果．
为检验某卤代烃R﹣X中的X元素下列操作1加热煮沸2加入AgNO3溶液3取少量该卤代烃4加入足量稀硝酸酸化5加入NaOH溶液6冷却．正确的操作顺序是
LookingUp IcanstillrememberthewaymytennisshoeslookedasIstareddownatthemfeelinganxiousaboutwhatwasabouttotakeplace.Itwastimefortheweeklyeleventh﹣gradevolleyballgame.IknewIwouldneverbethebest36onanyteam.ButeveryweekIstaredatmyshoesandsimplywishedIwouldn'tbepicked37.AndyetIwaslastalmosteverytime.Noteamwantedthegirlwhoalways38theballandmissedtheeasyserves. YearslaterIrealizedhowmuchthosemomentsof39hadaffectedme.Ibegantoexpectthe40ineverysituationrepeatedlytellingmyselfthatIjustwasn'tgoodenough.Igrewupstaringatmy41. Allthatbeganto42duringthesummervacationinhighschool.Mymom'ssisterAuntKarenofferedmeapart﹣timejob.IhadalwaysadmiredAuntKaren43shewassuccessfulandledsuchanexcitinglife.Hergoodmannerandwarmsmileweretotallydifferentfromthe44wayIapproachedtheworld.Butthatsummershetaughtmetolookatthings45. AuntKarensaidthatthesecret46successcomesfromtheinsidenottheoutside.Iwasshockedtolearnherexperiencehadbeensimilartomine.Shehadn'tbeengoodat47either!AuntKarensaidshefinallyrealizedwhatotherpeoplethoughtofherdidn't48asmuchaswhatshethoughtofherself.Shetoldmewhenshestartednoticingherowngoodqualitiesshe49beingsoself﹣critical. SothatsummerItookher50toheart.IlistenedtowhatIwassayingtomyselfanddecidedtofocusmoreonthegood.ForexamplewhenImisfiledanimportantpaperI51myselfofalltheotheronesIhadfiledcorrectly.AndwhenIwasshownthedirtyclosetIsaidtomyselfthatIwouldbegreatat52it.BeforelongIhadlearnedavaluablelesson.53thinkingactuallyworks! BythetimeschoolstartedthatfallIwasmuchmore54.Iwentalongwithpeoplearoundmewithatotallydifferentattitude.Whenmychemistryteacherannouncedthatweshouldeachfindalabpartner55lookingdownatmyshoesIlookedupandsmiled.Anddoyouknowwhathappened?Averynicegirlimmediatelyaskedmetobeinonegroup! 36. A.player B.teacher C.worker D.manager 37. A.fast B.soon C.only D.last 38. A.liked B.dropped C.sold D.studied 39. A.relaxation B.celebration C.rejection D.discussion 40. A.worst B.best C.latest D.least 41. A.hands B.shoes C.shorts D.legs 42. A.change B.continue C.settle D.grow 43. A.if B.unless C.until D.because 44. A.proper B.nervous C.careless D.comfortable 45. A.kindly B.seriously C.carefully D.differently 46. A.to B.with C.from D.at 47. A.chemistry B.language C.sports D.computer 48. A.stand B.matter C.cost D.expect 49. A.minded B.practiced C.stopped D.suffered 50. A.steps B.plans C.time D.advice 51. A.reminded B.rid C.warned D.accused 52. A.repairing B.cleaning C.designing D.decorating 53. A.Critical B.Deep C.Positive D.Creative 54. A.confused B.careful C.cautious D.confident 55. A.inchargeof B.inspiteof C.insteadof D.incaseof
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在此符号下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. ThemostimportantfestivalinTibetistheTibetanNewYearinJanuary1stoftheTibetancalendar.ItisforsaygoodbyetothepastyearanwelcomingtheNewYear.Frommid﹣Decemberpeoplestarttoprepareordofestivalshopping.AlotofactivityareheldinthestreetsoftheLhasaduringtheNewYearFestival.Thereisaninterestedcompetitiononthisday.Ayoungmanfromeachfamilytriedtogetthefirstbucketofwaterfromtheriver.Itisbelievedbegoldwater.AccordingtotheTibetantraditiontheywillbringgoodluckhappinessandwealthtothosewhichgetit.
对于定义在R上的函数fx下列命题 ①若f-2=f2则函数fx一定为偶函数 ②若f-2≠f2则函数fx一定不是偶函数 ③若f-2=f2则函数fx一定不是奇函数． 其中正确的命题的序号是把所有正确命题的序号都填上．
HowtoBecomeaMorningPerson? Herearesomehabitsyoucanfocusonthatcanhelpyoubecomeabettermorningperson 36 Forfiveminuteseachmorningwritethreethingsyouaregratefulfortoday.Practicinggratitudeaboutwhatwehavegoingforuscanrestructureourbraintofocusonpositivethings. Alwayshavebreakfast Ifyou'repressedfortimepicksomething.Abreakfastgivesyouenergyandit'sfuelforyourbrain. Tryreflecting Reflectingearlyinthedayevenfor10minuteshelptocleanyourbrainofanydisorderedthoughts.37.WithanappcalledHeadspaceyoucantryaguided10﹣minutereflection. Getmoving Toreallywakeyourentirebodyuppickanytypeofphysical.38oritcanbesomethingshorterandevensimpleramorningyogaroutine. Light Leaveyourbedroomcurtainsopen.39holdingbackmelatonin褪黑素productionandwakingyouup.Trytoexposeyourselftoasmuchsunlightaspossible. Enoughsleep ThismightseemobviousbutmostAmericansdon'tgetenoughsleepthesedays.Andifyou'reshortonsleepyou'lltendtosleeplate.Withtimethatwillpushyouintoalaterandlatersleepcycle. 40.Somepeopleseemtobemorningpeoplesomenightpeople. A.Developapositiveattitude B.Forceyourselftogetupinthemorning C.Keepagratitudediary D.Itcanbeanexerciseatthegym E.It'snotasdifficultasitsounds F.Thiswillallownaturalsunlighttocomein G.Andfinallyrememberthatpeoplediffer.
Howdoyoupayforthingsinashop?Perhapsyoulikethetouchablereliabilityofhardcash?Maybethefinancialflexibilityofacreditcardsuitsyoubetter?Orperhapsyoupreferthesimpleconvenienceofasmartphone? Whateveryouusetodayexpertsbelieveallthesemethodscouldsoonbecomeoutdated.Insteadwewilluseourbodiesoureyesourfingerprintsevenourmerepresenceinthestore.Infactit'shappeningalready.Amazonaretrialingstoreswhichhavenocheckoutswheretechnologytrackstheitemsyou'vetakenfromtheshelvesanddeducts扣除thetotalfromyouraccountwhenyouleavetheshop. FrenchsupermarketMonoprixtakesadifferentpathyouchooseyourgroceriesandleavethemwithahumancashier.Youthenleavetheshopwhilethecashieraddsupyourbillchargesyouraccountandorganizesdeliverytoyourhome. AmirCEOofBarclaycardpredictsthatsuchnewdevelopmentsmeantheendoftheplasticcreditcard.Insteadwearableitemssuchasringsnecklacesandkeychainswillcarrychips芯片thatallowshopperstoshopgoingbetweenthewebanapporinstore. Andwhilealltheabovepaymentmethodsaresupportedbyaccountsheldintraditionalcurrencieslet'snotforgettheriseofalternativessuchasLitecoin.Virtual虚拟currenciescanriseinvalueveryquickly.OnesuchpossibilityisexploredinthemovieInTime.Itimaginesafuturisticsocietyinwhichthecurrencyistimeitselfwherepeopletradetheamountoftimetheyhavelefttolive. Orperhapswe'ddobettertowindbacktheclocktothesimplerfinancialworldoftheequalexchangeeconomy.Whilethetermrecallsimagesofbagsofgrainandherdsofsheepbeingexchangedinancienttimestherearesignsthataremakingacomebackintoday'sworldofmoderntechnology.Maybetheonlythingweknowforcertainisthatmoneywillkeepupdating. 28.WhichofthefollowingstatementsisTRUE? A.PaymentisdonebythecashiersatAmazon. B.Allthemethodsofpaymenthavebecomeoutdated. C.ShoppingatMonoprixisconvenientforcustomers. D.CustomerscanleavetheircreditcardsatMonoprix. 29.WhatmightreplacethecreditcardsinthefutureaccordingtoAmir? A.Smartphones. B.Wearableitems. C.Virtualcurrencies. D.Fingerprints. 30.WhatisusedasacurrencyinthemovieInTime? A.Litecoin. B.Humanlife. C.Time. D.Bagsofgrain. 31.Whichisthebesttitleforthepassage? A.TheRiseofVirtualCurrencies. B.TheHistoryofMoney. C.TheEndingifCreditCards. D.TheChangingNatureofMoney.
有机物甲的分子式为C3H7Br在适宜的条件下能发生如下转化关系 已知B能发生银镜反应试回答下列问题 1甲的结构简式． 2B与银氨溶液反应的化学方程式． 3甲与NaOH醇溶液共热的化学方程式为． 4A与氧气反应生成B的化学方程式． 5D生成E的化学方程式．
热门题库
更多
高三下学期物理
高三上学期物理
高三上学期生物
高三上学期化学
高二下学期化学
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库
教案备课库
教案备课库
教案备课库
湘公网安备 43130202000226号